Method of applying an annealing separator to grain oriented magnetic steel sheets

Abstract

A water repellent, for example an organic silicon compound, is added to an annealing separator which is applied electrostatically to the surface of a grain oriented magnetic steel sheet, or a glass-like film forming undercoating formed on the sheet surface.

What is claimed is: 
     
       1. In a method of applying an annealing separator electrostatically to a glass-like film-forming undercoating consisting mainly of a magnesium oxide on the surface of a grain oriented magnetic steel sheet, thus overcoating said undercoating, the improvement wherein said annealing separator contains an organic silicon compound in a quantity of 0.3 to 3.00% by weight.